CN101421044B - Method for the production of very fine particles by means of a jet mill - Google Patents
Method for the production of very fine particles by means of a jet mill Download PDFInfo
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- CN101421044B CN101421044B CN2007800131720A CN200780013172A CN101421044B CN 101421044 B CN101421044 B CN 101421044B CN 2007800131720 A CN2007800131720 A CN 2007800131720A CN 200780013172 A CN200780013172 A CN 200780013172A CN 101421044 B CN101421044 B CN 101421044B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C19/00—Other disintegrating devices or methods
- B02C19/06—Jet mills
- B02C19/065—Jet mills of the opposed-jet type
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Abstract
The invention relates to a method for producing very fine particles by means of a jet mill (1). The relative distance a/dDuse between at least approximately concentric milling jet inlets (5) whose center lines intersect at least approximately in one point is adjusted in accordance with the pressure of the working medium, a representing the jet length and dDuse representing the nozzle diameter.
Description
Technical field
The present invention relates to adopt the most fine grain method of a kind of jet mill production.
Background technology
Treat that material sorting or to be milled is made up of thicker and thinner particle, in an air stream, carried, and forming logistics that this logistics is introduced in the shell of a pneumatic separator of jet mill.This logistics radially arrives in the separation wheel of pneumatic separator.In separation wheel, thicker particle is separated going out from air stream, and this air stream is then carrying thin particle and leaving separation wheel through an effuser vertically.So air stream is carrying fine grained to be filtered or to be produced and is being transported to a filter, in this filter, a kind of fluid for example air is separated from each other thin particle.
DE19824062A1 has introduced a kind of jet mill; In its grinding house, also introduce a sufficient beam of milling of the energy that forms by vapours at least with high fluid ability; Wherein grinding house is except the steam inlet device that is used at least one beam of milling; Inlet with the material that is used to mill, an outlet that is used for product; Meanwhile, in mill material and at least one zone of meeting, has roughly the same temperature at least by vapours and the beam of milling that material forms of milling.
In addition, for example in EP 0 472 930 B1, also introduced a kind of corresponding pneumatic separator that is used in particular for jet mill.This pneumatic separator and method of work thereof are still gratifying especially basically.
In DE 3 140 294 C2, introduced a kind of method and a kind of device, be used for a kind of mixtures of materials is separated into the composition with milling property of difference.Be difficult to the composition of milling in order to separate into a kind of composition that is prone to mill and a kind of by the mixtures of materials that the one-tenth with milling property of difference is grouped into; The state that steam that must mixtures of materials passed through to be imported or gas beam convert a kind of fluidisation to, and it is placed under the impact comminution.The intensity of impact comminution is so to regulate through the selection to operating pressure, speed and the direction of beam, makes that the mixtures of materials composition that only is easier to mill is pulverized.Handle with impact comminution and to be connected mutually; Be to place a kind of centrifugal force to separate material; Through this centrifugal force separating treatment, separate in the mixtures of materials that the material component that is easier to mill was never milled as coarse fodder as fines and the difficult material component that can mill.In this, adopted a kind of fluidised-bed spray formula grinding mill, above fluid bed, disposed a centrifugal force pneumatic separator, wherein the grinding mill shell has an annular gap that imports a unloading house in the circumference range of centrifugal force pneumatic separator.This annular gap is to regulate through a concentric ring that is introduced in the grinding mill shell on its width.The axis of each nozzle of fluidised-bed spray formula grinding mill is in the plane and intersects at a point, the oral area of the nozzle that direction is relative be in one with the concentric circle of grinding mill shell in.
DE3825469A1 has introduced a kind of method, is used for dispersion, pulverizing or separation and the sorting of solid material, adopts a kind of sorting jet mill for this reason, and on this kind sorting jet mill, a jet mill and a spiral streaming separator are combined.The supply of product is sent into dispersing chamber through the product feeding point by injection equipment and is achieved, and this dispersing chamber is by a lid, the in addition gauge of ring and base plate of milling.The gas of milling; It also is a sorting gas simultaneously; Be directed in the dispersing chamber with being installed in the nozzle in the ring of milling through a distributor chamber, and reach desired solid material loading, the time of staying and stall limit respectively according to inlet pressure, gas flow and the different of nozzle geometrical configuration at this place.The time of staying and stall limit can be adjusted in very wide scope through the supply of secondary air again, and this secondary air distributes through a cone, and flow through a concentric gap, in wide scope, change.Flow through by the supply in this gap through adjustable secondary air, just can realize the time of staying of solid material and the modulation of loading.Secondary air stream can change the possibility of passing that gets into a collection container, and the stall limit in the dispersing chamber is passed thicker value.Through having the concentric gap of variable-width, just can be continuously with in the composition discharging collection container thick or that be difficult to disperse.Through how much machine shapes of ring and different nozzle and the more or less supply of secondary air of milling,, can have influence on pulverizing result and separating resulting with adjustment mill atmospheric pressure, the volumetric flow of gas of milling.
In addition, the applicant's patent document EP 1 080 786 A1 disclose a kind of a kind of equipment that is used for method that the fluidised-bed spray formula mills, used device and is furnished with this device.Wherein, A fluid bed is sealed by a shell; This shell is in order to produce a kind of centrifugal force to fluid bed at least one is rich in the scope of fluid beam that energy ground gets into fluid bed; And around an axis rotation, this axis is at least approx perpendicular at least one fluid beam, and this fluid beam is in the opposite direction with centrifugal force basically.So just, can advantageously reach following purpose: after the fluid beam of rich ability gets into fluid bed, just begin immediately in the energy exchange between the solid material particle of the fluid beam various piece that is rich in energy; On the whole, the concentration of the solid material particle in the fluid beam improves.
Summary of the invention
The objective of the invention is further to optimize and utilize a kind of jet mill to produce the used a kind of method of fine grained.
Above-mentioned purpose so realizes, promptly regulates the relative distance a/d of the beam inlet of respectively milling of arranged concentric at least approx according to working medium pressure
Nozzle, wherein represent beam length, with d with a
NozzleExpression nozzle diameter, the center line of the said beam inlet of respectively milling are gone up on one point at least approx and are intersected.
Like this, advantageously provide a kind of method, can be used for improving greatly the work that utilizes a kind of jet mill that Compressed Gas carries out.
Favourable part is that each beam inlet of milling is all formed by an inlet nozzle or the nozzle of milling.
Another preferred design is: adopted 3 or 4 beam inlets of milling.
Preferentially adopted a kind of liquid bed jet mill.
In addition, preferably adopted a kind of dynamic pneumatic separator that is integrated into jet mill.In addition; Also advantageously done following setting: pneumatic separator comprises the sorting rotor or the separation wheel that have with ever-reduced radius the free height that constantly increases, and the area that makes the quilt of when work sorting rotor or separation wheel flow through is stablized constant at least approx.Also can make following setting in addition or by way of parenthesis: pneumatic separator comprises a sorting rotor or a separation wheel of being furnished with particularly removable insertion pipe, and this insertion pipe is like this design, makes that inserting pipe can rotate and rotate in company with sorting rotor or separation wheel.
Another of this method favourable development is, has disposed a fines and has discharged the chamber, and this discharge chamber streamwise has a kind of cross section and enlarges.
Only exemplarily the present invention is elaborated with embodiment below with reference to accompanying drawings.
Description of drawings
Fig. 1 schematically representes an a kind of embodiment of jet mill, and the part is the sketch map that cuts;
Fig. 2 illustrates a pneumatic separator of vertically arranged a kind of jet mill, as the longitdinal cross-section diagram placed in the middle of signal; Disposed the discharge pipe of the mixture that is used for forming by sorting air and solid granulates for separation wheel;
Fig. 3 schematically illustrates the vertical cross-section diagram of the separation wheel of a pneumatic separator;
Gas pressure p before Fig. 4 nozzle
0With relative spray beam length a
RelBetween graph of relation.
The specific embodiment
With reference to embodiment described below, illustrated in the accompanying drawings and application examples, only exemplarily the present invention is elaborated, the present invention is not limited to the features relevant combination in each embodiment and the application examples scope in other words.The characteristic of method and the characteristic of device can be found out from the explanation about apparatus and method respectively substantially.
That explain in conjunction with specific embodiment and/or illustrated each characteristic in addition; Be not limited to these embodiment and be not limited to all the other combination of features in other words with present embodiment; But can in the scope that technology allows, realize combination with any other variant, even these variants are not made special argumentation at the application's book.
Same reference numerals in each accompanying drawing is represented identical or similar or is acted on same or analogous part.With reference to illustrating in the accompanying drawing, can find out significantly that also those characteristics of not being furnished with Reference numeral also are that it doesn't matter with those characteristics of whether explaining hereinafter.On the other hand, comprising in this manual but do not illustrated those characteristics in the accompanying drawings, without a doubt, concerning the professional, also is self-evident.
Adopting a kind of jet mill to produce under the situation of the used method of fine grained, the production stage that is set by the present invention all is open-and-shut, so need not illustrate these production stages.
An a kind of embodiment of jet mill 1 schematically is shown among Fig. 1, is used to implement illustrated method now with it.Like what addressed, the method that the present invention proposes can manual implementation, and perhaps automation is implemented, and this can not have the influence of essence to the application of this method.The variant of automation certainly further reduces operational trouble; And can utilize some devices and mechanism to realize without a doubt; These devices all are known with mechanism to the professional, therefore also just needn't describe the present invention's proposition newly method to each perhaps very familiar step of professional.In a word; Sensing device, measurement mechanism, processor device and control device and control procedure are done general and special discussion all seem unnecessary; Because the transformation on the device of the method that the present invention proposes does not need distinctive Promethean step with regard to its ken.
Be merely explain and be convenient to understand for the purpose of; Radially the inlet or the inlet nozzle 9 of location constitute the beam of for example milling inlet 5 by one respectively; Done following setting: this inlet nozzle also can be referred to as the nozzle 9 of milling for this reason; The purpose that disposes this nozzle is to let the beam 10 of milling meet with very high energy enters into the scope of the beam 10 of milling with coming out from the material feeding point 4 of milling the material particles of milling, and lets the material particles of milling be ground into more fine fraction, and these particulate fractions are absorbed by separation wheel 8; One when they have corresponding small granularity or quality, are just outwards carried through products export 6.Layout like this through the beam inlet 5 of milling; Perhaps more precisely through the inlet nozzle of corresponding layout or the nozzle 9 of milling; The feasible beam inlet 5 of respectively milling is arranged concentric at least approx; Their center line at least generally intersects on a point, so can reach following purpose: form the beam 10 of milling of bump each other, these beam energies of milling are realized the crushing process of material particles more consumingly.In this, especially can obtain the better effect that can reach with 10 of the beam of milling than only, particularly milling with a plurality of mill beam such as 3 or 4 of preferred usefulness, beam reached.
For a kind of method is provided according to the present invention; Facilitate the use the operation that Compressed Gas effectively improves for example a kind of fluidised-bed spray formula of a kind of jet mill 1 grinding mill, regulate the relative spacing a/d of the beam inlet 5 of milling arranged concentric, that its center line at least roughly intersects at least approx on a point according to working medium pressure
Nozzle, represent beam length with a, with d
NozzleThe expression nozzle diameter.If existing condition has obtained satisfying, the beam of promptly milling inlet 5 is located especially in couples opposite to one anotherly, and above-mentioned adjusting neither be indispensable.3 or 4 the beam inlets 5 of milling are preferably arranged.Preferred in addition, each beam inlet 5 of milling is all formed by an inlet nozzle or the nozzle 9 of milling.In addition, both can adopt manual operations and control, also can adopt automation mechanized operation and control, and wherein also must dispose suitable detection table and put, to be used for detection operations pressure medium and the relative distance of surveying each beam inlet 5 of milling.The professional is familiar with this type device; These devices are used to survey, try to achieve and more relevant value; And be used for corresponding control and accent and move the beam inlet 5 of milling; So that regulate its relative distance,, and need not oneself do invention work so the professional is understanding under the situation of the present invention and can select without a doubt and use.Therefore, there is no need to further investigate this type device, promptly be used to survey, try to achieve the device with more relevant value, and be used for corresponding control and move the beam inlet 5 of milling so as to regulating the device that its specific phase is adjusted the distance.
In addition; For example processing temperature can be through milling material feed point 4 and mill between beam 10 scopes and to settle the thermal source 11 of an inside to influence; Perhaps also can be through in the scope of material feed point 4 outsides of milling, settling a corresponding thermal source 12 to regulate; Perhaps through to a kind of be that the processed of particle of the material of milling of heat influences; The material of this heat is issued in the material feed point 4 of milling in the situation of avoiding heat loss, and a feeder sleeve 13 is encased by a heat-insulating overcoat 14 for this reason. Thermal source 11 or 12 can be to use according to application purpose arbitrarily and therefore according to reason when it is used, and selects according to the market supply of material, thereby need not to carry out other elaboration.
For said temperature, particularly mill beam or an a plurality of temperature of milling beam 10 are correlated with, and the material temperature of milling should be at least approx corresponding to this beam temperature of milling.
In order to constitute the beam 10 of milling that gets into grinding house 3 through the beam inlet 5 of milling, for example can use vapours or other suitable fluid.When using vapours, set out thus, promptly the enthalpy of vapours after the beam inlet 5 of milling accordingly can be significantly less than the enthalpy before the inlet nozzle 9.Because the impact comminution energy needed should provide mainly as energy of flow, be can not ignore so on the contrary fall at the inlet 15 of inlet nozzle 9 and the pressure between its outlet 16 that sizable (pressure energy converts energy of flow as far as possible to) and temperature fall.Particularly temperature fall should through the material of milling add thermal compensation in so much, make the material of milling in the center 17 of grinding house 3 regional, under the situation of two beams 10 of milling of at least two mill beam 10 or many times that meet in opposite directions, have identical temperature with the beam 10 of milling.
Preparation for the beam of milling that particularly constitutes and implement to constitute by vapours with the system form of sealing; With reference to DE 198 24 062 A1; Its all disclosure is quoted through existing Reference numeral correspondingly for fear of simple indiscriminately imitating fully all sidedly.Through the system of this sealing, for example can realize milling with the operating efficiency of the best as the warm sludge of the material of milling.
In the diagram of the present embodiment of jet mill 1 for each supply of working media B illustrates for example casing 18a of a storage or generating means 18 with representing, thus working media B via pipe guide 19 guiding mill beam inlet 5, be used to constitute mill the beam inlet 5 or the beam 10 of milling of beam 10.Replace casing 18 for example also can use compressor reducer, so that improve corresponding work medium B.
Particularly from a jet mill 1 that is equipped with such pneumatic separator 7; Wherein respective embodiments only is exemplary and does not should be understood to restrictively, utilizes the jet mill 1 of this dynamic pneumatic separator 7 with integration to implement the method that is used to produce the meticulousst particle.Usually use a kind of fluid as working media B, the steam of preferably having mentioned already also can be hydrogen or helium or simple air.
Favourable in addition and at this preferably, when sorting rotor 8 has one with ever-reduced radius during towards free height that its axis direction constantly increases, wherein particularly sorting rotor 8 flow areas are constant.Additionally or alternatively, a fines exhaust chamber (not shown) can be set, it has the cross section expansion section on flow direction.
Preferred especially structure is that pneumatic separator 8 has an insertion pipe 20 removable, that companion is rotated in grinding mill 1.
Just to setting forth and deepening whole understanding, next the particle to be produced that is made up of preferred material to be processed is described still.For example relate to unbodied SiO at this
2Or other unbodied chemical products, it utilizes jet mill to pulverize.Other material is silicic acid, silica gel, silicate or is base or the material that comprises carbon black with the carbon black.
Next set forth the structure of the example of jet mill 1 and its element with reference to figure 2 and 3.
As seeing by the sketch map of Fig. 2; Jet mill 1 comprises the pneumatic separator 7 of an integration; Be a dynamic pneumatic separator 7 in the structural form of jet mill 1 as fluidised-bed spray formula grinding mill for example wherein, it is advantageously provided in the grinding house 3 of jet mill 1 intracardiac.Can influence the fineness of the material of being pursued of milling according to mill gas volume flow and separator rotating speed.
In the pneumatic separator 7 according to the jet mill 1 of Fig. 2, whole vertical pneumatic separator 7 is surrounded by a separator shell 21, and it is made up of shell upper 22 and outer casing underpart 23 basically.Shell upper 22 is provided with each one outwards directed circumferential flange 24 or 25 with outer casing underpart 23 on the edge of top or bottom.Two circumferential flanges 24 or 25 recline under the installation of sorting rotor 8 or functional status and through suitable device relative fixed each other.Suitable fixture for example is the spiral fastener (not shown).As dismountable fixture can also be anchor clamps (not shown) etc.
One of flange circumference almost arbitrarily on the position two circumferential flanges 24 so be connected each other through joint 26 with 25, make shell upper 22 flange connector dismounting back can be upwards with respect to outer casing underpart 23 along the direction deflection of arrow 27 and shell upper 22 from below and outer casing underpart 23 from can be approaching.Outer casing underpart 23 self two parts constitute and basically by columniform separation chamber shell 28 (it has circumferential flange 25 on the opened end portions on top) and a discharge cone 29, its downward tapered reduction.Discharge cone 29 and on end top or the bottom, recline, and two flanges 30,31 of discharge cone 29 and separation chamber's shell 28 are connected to each other through dismountable fixture (not shown) as circumferential flange 24,25 with flange 30,31 top or the bottom with separation chamber's shell 28.So the separator shell 21 of assembling be suspended in the supporting arm 28a or on, a plurality of among them as far as possible evenly separatedly around the circle distribution of the separator of pneumatic separator 7 or compressor case 21 and act on the columniform separator chamber enclosure 28.
The major part of the shell built-in fitting of pneumatic separator 7 also is a separation wheel 8; Its shrouding disc 32, one with a top is the shrouding disc 33 of the outflow side of axially spaced bottom and that be provided with between the outward flange of two shrouding discs 32 and 33, that be fixedly connected with said shrouding disc and evenly around the blade 34 of the circle distribution of separation wheel 8, it has the profile that meets purpose with it.The driving of separation wheel 8 causes through the shrouding disc 32 on top in this pneumatic separator 7, and the shrouding disc 33 of bottom is the shrouding disc of outflow side.The supporting of separation wheel 8 comprises a sorting wheel shaft 35 of advantageously forcing to drive, and it is derived from separator shell 21 with the upper end and supports separation wheel 8 with supporting rotational fixation ground with activity in separator shell 21, its bottom.Sorting wheel shaft 35 is realized in a pair of processed plate 36,37 by the derivation in the separator shell 21; Said plate seals separator shell 21, guiding sorting wheel shaft 35 and seals this openings on the upper end of the outer casing end portion section 38 that the truncated cone shape that makes progress extends, and can not stop rotatablely moving of sorting wheel shaft 35.Advantageously the plate 36 on top is equipped with to sorting wheel shaft 35 and via swivel bearing 35a as flange rotational fixation ground and can be rotated to support on the plate 37 of bottom, and this plate self is equipped with gives an outer casing end portion section 38.In the common plane of the bottom side of the shrouding disc 33 of outflow side between circumferential flange 24 and 25, thereby separation wheel 8 is arranged in the turnover shell upper 22 on the whole.A tubular product feed that has the material material inlet 4 of milling on the regional inside and outside shell top 22 of conical outer casing end portion section 38 in addition takes over 39, and the rotation 40 that its longitudinal axis is same as separation wheel 8 and driving shaft or sorting wheel shaft 35 extends and it is arranged on the radially outer of shell upper 22 away from rotation 40 ground of separation wheel 8 and driving or sorting wheel shaft 35 as far as possible.
Separator shell 21 holds the tubular outlet connection 20 with the identical setting of separation wheel 8 axis, and this outlet connection is positioned at shrouding disc 33 belows of the outflow side of separation wheel 8 hermetically with its upper end, yet is not connected with it.Axis is placed one identically and is discharged chamber 41 on the bottom of the outlet connection that constitutes pipe 20, and it is tubular equally, yet its diameter is significantly greater than the diameter of outlet connection 20 and be the twice of the diameter of outlet connection 20 in the present embodiment at least.Also there is a tangible diameter sudden change in transition position between outlet connection 20 and discharge chamber 41.Outlet connection 20 inserts in the cover plate 42 on a top of discharging chamber 41.Discharge chamber 41 below through removable cover plate 43 sealings.Remain in a plurality of supporting arms 44 by outlet connection 20 and the structural unit that discharge chamber 41 constitutes; Supporting arm star ground evenly distributes around the circumference of structural unit, in the zone of outlet connection 20, is fixedly connected with structural unit and is fixed on the separator shell 21 with their outer end with their inner end.
Supporting arm 44 is parts of scavenging arrangement (not shown) with annular outer cover 45, and wherein the air used of scavenging stops material to be got into the gap that is positioned between separation wheel 8 (or speak by the book be the shrouding disc 3 of its underpart) and the outlet connection 20 by the inner chamber of separator shell 21.For the air that makes scavenging use gets into annular outer cover 45 and gets into gap to be opened from there; Supporting arm 44 constitutes pipe, utilizes its outside end portion section to pass the wall of separator shell 21 and is connected (not shown) on the air source that a scavenging uses via suction strainer 46.Annular outer cover 45 upwards can be through the annular disk adjusting in axial adjustable, the zone between the shrouding disc 33 of the bottom of orifice plate 47 and separator 8 through 47 sealings of an orifice plate and gap self.
The outlet of discharging chamber 41 is made up of a fines discharge pipe 48, and it imports from the outside in the separator shell 21 and be connected with the layout of tangential and discharges on the chamber 41.Fines discharge pipe 48 is parts of products export 6.A baffle plate that turns to cone (Abweiskegel) 49 as the feeding mouth of fines discharge pipe 48 on discharge chamber 41.
On the bottom of conical outer casing end portion section 38, be equipped with a sorting air and get into spiral 50 and a coarse fodder outlet 51 with the outer casing end portion that the assigns section 38 of level.The direction of rotation of sorting air entering spiral 50 is opposite with the direction of rotation of separation wheel 8.Coarse fodder outlet 51 removably is equipped with gives outer casing end portion section 38; Wherein the bottom of outer casing end portion section 38 is equipped with the end on the top of a flange 52 and coarse fodder outlet 51; And when pneumatic separator 7 preparations, two flanges 52 also removably are connected through known mechanism with 53.
Discrete areas to be arranged is utilized 54 expressions.The flange that is used for neat guide of flow and simply sealing of processing (milling system) utilizes 55 to represent on inward flange.
At last, still can be placed on the inwall of discharging chamber 41 as closure member and a corresponding removable protection tube 57 at removable protection tube 56 of placement on the inwall of outlet connection 20.
Shown in duty under when the work of pneumatic separator 7 begins, get into spiral 50 and the sorting air met the admission velocity of selecting the destination import in the pneumatic separator 7 under the situation that a pressure falls and with one via the sorting air.Because the sorting air upwards rises up into sorting air spirality ground in the zone of separation wheel 8 by means of the importing that spiral particularly combines with the taper of outer casing end portion section 38." product " be made up of the solid particle of different quality simultaneously taken over 39 via the product feed and fed in the separator shell 21.Coarse fodder, the particulate fraction that promptly has big quality gets into coarse fodder outlet 51 and prepares to be used for further processing in contrast to the sorting air from said product.Fines; The particulate fraction that promptly has less material; Mix with the sorting air, inwardly get in the outlet connection 20, get into and discharge chamber 41 and get into fines outlet 58 via fines discharge pipe 48 at last along radially passing separation wheel 8 from the outside; And get into the filter from there, for example air and fines are separated from one another for the working media of fluid form in this filter.Thicker fines part throws away and mixes with coarse fodder by separation wheel 8 is radially centrifugal; So that leave and separator shell 21 or circulation in separator shell 21 so for a long time with coarse fodder; Until the fines that becomes this granularity, make it utilize the sorting air to discharge.
Owing to enlarge to the unexpected cross section of discharging chamber 41 from outlet connection 20, significantly the reducing of flowing velocity of fines-air mixture taken place at there.This mixture also gets into fines outlet 58 in and the wearing and tearing that on the wall of discharging chamber 41 only produce less amount through discharging chamber 41 via fines discharge pipe 48 with very little flowing velocity.Protection tube 57 also only has the anti-measure of maximum prefetch for this reason.Owing to yet reason still being present at a high speed in separation wheel 8 of isolation technics preferably discharges or flow out and take in 20, protection tube 56 is more important than protection tube 57 for this reason.It is especially important to have the diameter sudden change of widening at the diameter that gets into the transition position of discharging chamber 41 from outlet connection 20.
Be equipped with to each single part shell through the division and the separator element of separator shell 21 according to aforesaid way in addition, pneumatic separator 7 can be safeguarded and can be utilized less expense well and in very short maintenance time, changes the element that damages.
Except comprising leaf grating ring 59, also have the shrouding disc 32 on top and the shrouding disc 33 of the outflow side of axially spaced bottom with it according to the separation wheel 8 of Fig. 3 with blade 34, and can be around rotation 40 and the therefore longitudinal axis rotation of pneumatic separator 7.The radial dilatation of separation wheel 8 is perpendicular to rotation 40, promptly perpendicular to the longitudinal axis of pneumatic separator 7, with rotation 40 with therefore the horizontal or vertical extension of described longitudinal axis is irrelevant.The shrouding disc 33 of the outflow side of bottom surrounds outlet connection 20 with one heart.Blade 34 is connected with 32 with two shrouding discs 33.Two shrouding discs 32 constitute with prior art now with 33 differently and are preferred like this; The shrouding disc 32 that is top is inside from the leaf grating ring 59 of blade 34 with the spacing of the shrouding disc 33 of outflow side; Promptly towards the direction of rotation 40, become greatly and preferably continuously, for example linearly or non-linearly; And have advantage in addition, promptly be used for being kept constant by the area of through-flow cylindrical shell what blade flowed out each radius between edge and the outlet connection 20.Because the rate of outflow that the radius that in known solutions, diminishes diminishes keeps constant in this scheme.
Except the structural scheme of the shrouding disc 33 of the shrouding disc 32 on the top of in Fig. 3, setting forth and bottom; Also possible is; These two shrouding discs 32 or 33 wherein only one conically in a manner mentioned above constitute and other shrouding disc 33 or 32 is planes, be this situation as combining with the embodiment that is used for shrouding disc 32 and 33 according to Fig. 2.Particularly the shape of the shrouding disc of non-planar shaped is such, and is promptly like this at least approx, makes to be used for being kept constant what blade flowed out the edge and flowed out each radius of taking between 20 by the area of through-flow cylinder blanket.
Next in order further to set forth and, to inquire into the beam length of the best in the jet mill as the basis of others of the present invention.
By at low pressure range (p
0<4bar (abs)) result of the test in is observed can draw the beam length and the related conclusion of existence between the gas pressure of milling in the best.Next the equation that quantizes this association is shown.Realize a kind of theoretical prediction simultaneously, whether this association also is associated with the gas temperature of milling.
In order to be described in the process of beam between expansionary phase; At first from then on, set out; Promptly not only (treat that through the beam shell particulate solids gets into beam on the beam shell; So that be accelerated and pulverize at there) and go up the pressure ratio of (maybe two or more beam crossovers) at this at " obstruction face ", should be constant.
Supposition in addition, pressure ratio is associated with momentum current density in the beam:
A wherein
Beam(m
2) area of beam;
C
1Constant
I
*(N/m
2) the momentum current density
m
L(kg/s) gas mass flow
v
Ad(m/s) (adiabate) gas velocity of the thermal insulation after the nozzle
(can consider mass flow and speed on jet expansion) because the stream of the momentum in the beam keeps.
Putting before this; Be the beam taper widen and beam opens wide angle [alpha] and pressure and temperature correlation (at least the first at Hagele; Joachim:ExperimentelleUntersuchungen an Aerosolstrahlen aus Mikrod ü sen;-Mitteilungenaus dem Max-PlanckInstitut f ü r
Nr.72; In 1981 the experiment for the nozzle that continues to dwindle and equally for for the suitable Laval nozzle of pressure ratio, being determined), two areas are confirmed according to following geometrical relationship:
A
Beam=C
2π a
2(2)
With C
2=f (a) (3), wherein C
2The expression constant, a (m) representes beam length.
Gas mass flow through a nozzle draws thus:
The beam rate of outflow of adiabatic curve:
Wherein:
d
Nozzle(m) nozzle diameter
ML (kg/s) flow quality stream
P1 (bar/ (abs)) expansion pressure
Gas pressure before p0 (bar/ (the abs)) nozzle
R (kJ/kgK) gas constant
Gas temperature before T0 (K) nozzle
The K isentropic index
ψ
MaxEfflux coefficient (Ausflusskoeffizient)
When equality 2,4 and 5 is inserted equality 1, obtain:
Utilize at last
(9) and constant C, obtain such modification
Beam length a
RelOnly relevant with mill gas pressure p0, pressure ratio p1/p0 and κ, however irrelevant with the gas temperature of milling.
By the experiment (also referring to Nied, R.:Strahlmahlung in derFleissbettgegenstrahlm ü hle; Tiz109 (1985) 1, and is S.23ff) known:
Gas pressure p0=7bar (abs) mills; Pressure ratio; κ=1.4, relative beam length a
Rel=20.
Obtain the value of constant C: C=9 thus, 922 (11).
Equality 10 (C with equality 11) figure that relation between air pressure p0 in Fig. 4 before nozzle and the relevant beam length is estimated based on chart expresses.
The present invention is by means of only schematically illustrating and be not limited thereto among the embodiment in specification and accompanying drawing; But comprise all schemes; Modification and subcase and combination; Its professional person for this area particularly draws in the scope of claim and the described type of beginning and in the description of embodiment and accompanying drawing thereof, and utilizes its professional knowledge and prior art combination.Particularly all single characteristics can be combined with structure possibility and embodiment thereof.
List of numerals
1 jet mill
2 columniform shells
3 grinding house
The 4 material material inlets of milling
5 mill beam inlets
6 products exports
7 pneumatic separators
8 separation wheels
9 ingates or inlet nozzle or the nozzle of milling
10 beams of milling
11 thermals source
12 thermals source
13 feeder sleeves
14 heat-insulating overcoats
15 inlets
16 outlets
The center of 17 grinding house
18 storage or generating means
19 pipe guides
20 insert pipe
21 separator shells
22 shell upper
23 outer casing underparts
24 circumferential flanges
25 circumferential flanges
26 joints
27 arrows
28 separation chamber's shells
The 28a supporting arm
29 discharge cone
30 flanges
31 flanges
32 shrouding discs
33 shrouding discs
34 blades
35 sorting wheel shafts
35a sorting wheel shaft
36 swivel bearings
The plate of the processing of 37 bottoms
The plate of the processing on 38 tops
39 product feeds are taken over
40 rotations
Discharge chambers 41
The cover plate on 42 tops
43 removable cover plates
44 supporting arms
The annular outer cover of 45 tapers
46 suction strainers
47 orifice plates
48 fines discharge pipes
49 turn to cone
50 sorting air get into spiral
51 coarse fodder outlets
52 flanges
53 flanges
54 discrete areas
55 on inward flange processing (milling system) flange and seal
56 removable protection tubes
57 removable protection tubes
58 fines outlets
59 leaf grating rings
Claims (9)
1. be used for producing the most fine grain method, it is characterized in that, regulate the relative distance a/d of the beam inlet (5) of respectively milling of arranged concentric at least approx according to working medium pressure by means of jet mill (1)
Nozzle, wherein represent beam length, with d with a
NozzleExpression nozzle diameter, the center line of the said beam inlet of respectively milling are gone up on one point at least approx and are intersected.
2. the method for claim 1 is characterized in that, each beam inlet (5) of milling constitutes through an inlet nozzle or the nozzle of milling (9).
3. according to claim 1 or claim 2 method is characterized in that, has three or four the beams inlets (5) of milling.
4. according to claim 1 or claim 2 method is characterized in that, uses a fluidised-bed spray formula grinding mill.
5. the method for claim 1 is characterized in that, uses a dynamic pneumatic separator (7) that is integrated in the jet mill (1).
6. method as claimed in claim 5; It is characterized in that; Pneumatic separator (7) comprises a sorting rotor or separation wheel (8); This sorting rotor or separation wheel have along with radius reduces and the free height that constantly increases, thereby sorting rotor or separation wheel (8) is kept constant at least approx by through-flow area when work.
7. like claim 5 or 6 described methods; It is characterized in that; Pneumatic separator (7) comprises a sorting rotor or separation wheel (8), and this sorting rotor or separation wheel have one and insert pipe (20), and this insertion pipe is configured such that it rotates together when sorting rotor or separation wheel (8) rotation.
8. like above-mentioned claim 1 or 2 described methods, it is characterized in that a fines is set discharges chamber (41), this fines is discharged chamber and on flow direction, had a cross section expansion section.
9. method as claimed in claim 7 is characterized in that, said insertion pipe (20) can be replaced.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102006017472A DE102006017472A1 (en) | 2006-04-13 | 2006-04-13 | Method for producing finest particles by means of a jet mill |
| DE102006017472.0 | 2006-04-13 | ||
| PCT/DE2007/000649 WO2007118460A1 (en) | 2006-04-13 | 2007-04-13 | Method for the production of very fine particles by means of a jet mill |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101421044A CN101421044A (en) | 2009-04-29 |
| CN101421044B true CN101421044B (en) | 2012-11-28 |
Family
ID=38461131
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2007800131720A Active CN101421044B (en) | 2006-04-13 | 2007-04-13 | Method for the production of very fine particles by means of a jet mill |
Country Status (8)
| Country | Link |
|---|---|
| US (1) | US8177149B2 (en) |
| EP (1) | EP2004329B1 (en) |
| JP (1) | JP5463138B2 (en) |
| CN (1) | CN101421044B (en) |
| BR (1) | BRPI0710652B1 (en) |
| DE (1) | DE102006017472A1 (en) |
| ES (1) | ES2773730T3 (en) |
| WO (1) | WO2007118460A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107810065A (en) * | 2015-06-15 | 2018-03-16 | 耐驰干法研磨技术有限公司 | For crushing the method for milling material and grinding mill for implementing this method |
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|---|---|---|---|---|
| DE102006017472A1 (en) | 2006-04-13 | 2007-10-18 | Nied, Roland, Dr. Ing. | Method for producing finest particles by means of a jet mill |
| DE102006023193A1 (en) | 2006-05-17 | 2007-11-22 | Nied, Roland, Dr.-Ing. | Method for producing finest particles by means of a jet mill |
| DE102006048864A1 (en) | 2006-10-16 | 2008-04-17 | Roland Dr. Nied | Process for the production of finest particles and jet mill therefor and air classifier and operating method thereof |
| DE102009045116A1 (en) | 2009-09-29 | 2011-03-31 | Evonik Degussa Gmbh | Niederdruckvermahlungsverfahren |
| US20120325942A1 (en) * | 2011-06-27 | 2012-12-27 | General Electric Company | Jet milling of boron powder using inert gases to meet purity requirements |
| DE102013000426A1 (en) * | 2013-01-14 | 2014-07-17 | Roland Nied | Method for jet grinding and jet mill for it |
| CN103977870B (en) * | 2014-05-26 | 2016-03-30 | 北京航空航天大学 | Air-flow crushing stripping technology is adopted to prepare the method for Graphene presoma two-dimensional nano graphite powder |
| US10780443B2 (en) * | 2017-05-11 | 2020-09-22 | Roger Swensen | Method, system and apparatus for hard contaminate separation from a particulate |
| CN107213972B (en) * | 2017-05-17 | 2019-06-04 | 宁波拜尔玛生物科技有限公司 | Mannosan and its anti-tumor virus applications based on nanotechnology preparation |
| DE102018120596A1 (en) * | 2018-08-23 | 2020-02-27 | Netzsch Trockenmahltechnik Gmbh | Method and device for removing difficult-to-grind particles from a spiral jet mill |
| US11731142B2 (en) * | 2019-01-09 | 2023-08-22 | Qwave Solutions, Inc. | Methods of jet milling and systems |
| DE102020006724A1 (en) * | 2020-11-03 | 2022-05-05 | Netzsch Trockenmahltechnik Gmbh | Method of operation for a sifter and sifter for classification |
| DE102021002671A1 (en) | 2021-05-21 | 2022-11-24 | Hosokawa Alpine Aktiengesellschaft | Process for determining the optimum nozzle spacing in jet mills and grinding processes for producing the finest particles |
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Also Published As
| Publication number | Publication date |
|---|---|
| EP2004329A1 (en) | 2008-12-24 |
| CN101421044A (en) | 2009-04-29 |
| BRPI0710652A2 (en) | 2011-08-23 |
| US8177149B2 (en) | 2012-05-15 |
| JP5463138B2 (en) | 2014-04-09 |
| DE102006017472A1 (en) | 2007-10-18 |
| US20100065668A1 (en) | 2010-03-18 |
| JP2009533207A (en) | 2009-09-17 |
| EP2004329B1 (en) | 2019-11-27 |
| ES2773730T3 (en) | 2020-07-14 |
| WO2007118460A1 (en) | 2007-10-25 |
| BRPI0710652B1 (en) | 2020-05-19 |
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